okay I am not understanding this...It's not about "the economy". The trouble is how PCs turn into a failed comic book character at no cost no themselves & the completely implausible results if the GM doesn't inflict a documented motivation problem on their campaign.
I mean if I through around PP everywhere I guess I could see it, maybe. The thing is sooner or later if I did that every shop every town i WOULD sooner or later run out of platinum. but if every few days I throw some crazy number at someone it will last me forever anyway AND it wont crash any economies...
if you think this is bad you should see what we do with magic items... Oh our 11th level party has a dozen unclaaimed items (like weapons we don't use or armors no one uses or anything we just don't attune to) lets go give them to town gaurd... or more then once 'tribes"
in a game I played about 6ish years ago we had a bunch of daggers and shortswords that were plus 1... we all kept 1 as 'back up weapon' then they just sat in a haversack. When we found out about a kobold problem we negotiated a truce between teh town and the kobolds then out fitted them with +1 weapons